Ok. The urine thing, I have no experience with. I would REMOVE the OTHER TOAD IMMEDIATELY. It might be easier to just put the other toad in a different tank, since the other toad has already infected everything in the tank (If its contagious.)

When it comes to not eating- Was he wild caught? If so try wild caught foods. Like a moth or pillbugs maybe. Once my toad looked super depressed, I dumped a bunch of pillbugs in her tank and she perked right up. It's a possibility (With the not eating) that he could be compacted... Have you tried soaking him?
I'm not an expert, But Just saw this today and saw that no one else has commented.
How is he now? I do hope this goes for the best!